It looks like Mary-Kate Olsen has engagement on the brain! Everyone's favorite child star turned critically-acclaimed fashion designer has been recently spotted shopping for an engagement ring. And she's looked more than just once—The Row designer was seen perusing Neil Lane's Los Angeles boutique in mid-November and then again several times since, Page Six reports.

"Mary-Kate has been seen several times in the last three weeks checking out huge engagement rings at the Neil Lane store. She really likes cushion-cut diamonds, and all of the rings she has looked at are over five carats," says Page Six's source. "She has narrowed it down, but still hasn't made a final decision."

Although Mary-Kate has been shopping solo, she's been seen by boyfriend Olivier Sarkozy's (former French President Nicolas Sarkozy's half brother) side for more than a year. The two can often be found cozying up at Knicks games or out in the Hamptons, despite much skepticism about their age difference (the two are 17 years apart).

This isn't the first time the high-profile couple has sparked marriage rumors. In January, Olsen was seen wearing a ring on her left hand during a trip to Paris.

According to the source, the lovestruck Olsen has been looking at rings that cost more than $100,000, leaving us wondering if her ring will be in the same league as Kim Kardashian and Ciara's 15 carat show-stoppers. We do know one thing, though: If Mary-Kate gets married, her high-end boho look and design chops will make for one memorable wedding dress. We're also anxious to see what her twin Ashley would wear as maid of honor. Here's to hoping our curiosity will be satiated soon!